This thread is resolved. Here is a description of the problem and solution.
Problem:
If you browse to the website without the language suffix (e.g., https://telium.io), the site renders incorrectly. This issue is likely related to how WPML handles redirection and language URL settings.
Solution:
We recommend checking the WPML settings under WPML → Languages → Language URL format. If you have the option 'Use directory for default language' enabled, you have two main options:
1. Uncheck the 'Use directory for default language' option. This change will allow https://telium.io/ to display the root page as intended.
2. Set up a redirect from https://telium.io/ to https://telium.io/en/ if you prefer to keep using the 'Use directory for default language' setting. You can find detailed instructions on setting up this redirect here.
Please note that this solution might be outdated or not applicable to your specific case. We highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. If the issue persists, please open a new support ticket.
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This topic is split from https://wpml.org/forums/topic/wpml-causing-fatal-error-on-wordpress/